arch/s390/kernel/compat_linux.c

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 2000
   4  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   5  *               Gerhard Tonn (ton@de.ibm.com)
   6  *               Thomas Spatzier (tspat@de.ibm.com)
   7  *
   8  *  Conversion between 31bit and 64bit native syscalls.
   9  *
  10  * Heavily inspired by the 32-bit Sparc compat code which is
  11  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  12  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
  13  *
  14  */
  15
  16
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/fs.h>
  20 #include <linux/mm.h>
  21 #include <linux/file.h>
  22 #include <linux/signal.h>
  23 #include <linux/resource.h>
  24 #include <linux/times.h>
  25 #include <linux/smp.h>
  26 #include <linux/sem.h>
  27 #include <linux/msg.h>
  28 #include <linux/shm.h>
  29 #include <linux/uio.h>
  30 #include <linux/quota.h>
  31 #include <linux/module.h>
  32 #include <linux/poll.h>
  33 #include <linux/personality.h>
  34 #include <linux/stat.h>
  35 #include <linux/filter.h>
  36 #include <linux/highmem.h>
  37 #include <linux/highuid.h>
  38 #include <linux/mman.h>
  39 #include <linux/ipv6.h>
  40 #include <linux/in.h>
  41 #include <linux/icmpv6.h>
  42 #include <linux/syscalls.h>
  43 #include <linux/sysctl.h>
  44 #include <linux/binfmts.h>
  45 #include <linux/capability.h>
  46 #include <linux/compat.h>
  47 #include <linux/vfs.h>
  48 #include <linux/ptrace.h>
  49 #include <linux/fadvise.h>
  50 #include <linux/ipc.h>
  51 #include <linux/slab.h>
  52
  53 #include <asm/types.h>
  54 #include <asm/uaccess.h>
  55
  56 #include <net/scm.h>
  57 #include <net/sock.h>
  58
  59 #include "compat_linux.h"
  60
  61 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |
  62                       PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |
  63                       PSW32_MASK_PSTATE | PSW32_ASC_HOME;
  64
  65 /* For this source file, we want overflow handling. */
  66
  67 #undef high2lowuid
  68 #undef high2lowgid
  69 #undef low2highuid
  70 #undef low2highgid
  71 #undef SET_UID16
  72 #undef SET_GID16
  73 #undef NEW_TO_OLD_UID
  74 #undef NEW_TO_OLD_GID
  75 #undef SET_OLDSTAT_UID
  76 #undef SET_OLDSTAT_GID
  77 #undef SET_STAT_UID
  78 #undef SET_STAT_GID
  79
  80 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
  81 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
  82 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
  83 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
  84 #define SET_UID16(var, uid)     var = high2lowuid(uid)
  85 #define SET_GID16(var, gid)     var = high2lowgid(gid)
  86 #define NEW_TO_OLD_UID(uid)     high2lowuid(uid)
  87 #define NEW_TO_OLD_GID(gid)     high2lowgid(gid)
  88 #define SET_OLDSTAT_UID(stat, uid)      (stat).st_uid = high2lowuid(uid)
  89 #define SET_OLDSTAT_GID(stat, gid)      (stat).st_gid = high2lowgid(gid)
  90 #define SET_STAT_UID(stat, uid)         (stat).st_uid = high2lowuid(uid)
  91 #define SET_STAT_GID(stat, gid)         (stat).st_gid = high2lowgid(gid)
  92
  93 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
  94 {
  95         return sys_chown(filename, low2highuid(user), low2highgid(group));
  96 }
  97
  98 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
  99 {
 100         return sys_lchown(filename, low2highuid(user), low2highgid(group));
 101 }
 102
 103 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
 104 {
 105         return sys_fchown(fd, low2highuid(user), low2highgid(group));
 106 }
 107
 108 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
 109 {
 110         return sys_setregid(low2highgid(rgid), low2highgid(egid));
 111 }
 112
 113 asmlinkage long sys32_setgid16(u16 gid)
 114 {
 115         return sys_setgid((gid_t)gid);
 116 }
 117
 118 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
 119 {
 120         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 121 }
 122
 123 asmlinkage long sys32_setuid16(u16 uid)
 124 {
 125         return sys_setuid((uid_t)uid);
 126 }
 127
 128 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
 129 {
 130         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 131                 low2highuid(suid));
 132 }
 133
 134 asmlinkage long sys32_getresuid16(u16 __user *ruidp, u16 __user *euidp, u16 __user *suidp)
 135 {
 136         const struct cred *cred = current_cred();
 137         int retval;
 138         u16 ruid, euid, suid;
 139
 140         ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
 141         euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
 142         suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
 143
 144         if (!(retval   = put_user(ruid, ruidp)) &&
 145             !(retval   = put_user(euid, euidp)))
 146                 retval = put_user(suid, suidp);
 147
 148         return retval;
 149 }
 150
 151 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
 152 {
 153         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 154                 low2highgid(sgid));
 155 }
 156
 157 asmlinkage long sys32_getresgid16(u16 __user *rgidp, u16 __user *egidp, u16 __user *sgidp)
 158 {
 159         const struct cred *cred = current_cred();
 160         int retval;
 161         u16 rgid, egid, sgid;
 162
 163         rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
 164         egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
 165         sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
 166
 167         if (!(retval   = put_user(rgid, rgidp)) &&
 168             !(retval   = put_user(egid, egidp)))
 169                 retval = put_user(sgid, sgidp);
 170
 171         return retval;
 172 }
 173
 174 asmlinkage long sys32_setfsuid16(u16 uid)
 175 {
 176         return sys_setfsuid((uid_t)uid);
 177 }
 178
 179 asmlinkage long sys32_setfsgid16(u16 gid)
 180 {
 181         return sys_setfsgid((gid_t)gid);
 182 }
 183
 184 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
 185 {
 186         struct user_namespace *user_ns = current_user_ns();
 187         int i;
 188         u16 group;
 189         kgid_t kgid;
 190
 191         for (i = 0; i < group_info->ngroups; i++) {
 192                 kgid = GROUP_AT(group_info, i);
 193                 group = (u16)from_kgid_munged(user_ns, kgid);
 194                 if (put_user(group, grouplist+i))
 195                         return -EFAULT;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
 202 {
 203         struct user_namespace *user_ns = current_user_ns();
 204         int i;
 205         u16 group;
 206         kgid_t kgid;
 207
 208         for (i = 0; i < group_info->ngroups; i++) {
 209                 if (get_user(group, grouplist+i))
 210                         return  -EFAULT;
 211
 212                 kgid = make_kgid(user_ns, (gid_t)group);
 213                 if (!gid_valid(kgid))
 214                         return -EINVAL;
 215
 216                 GROUP_AT(group_info, i) = kgid;
 217         }
 218
 219         return 0;
 220 }
 221
 222 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
 223 {
 224         int i;
 225
 226         if (gidsetsize < 0)
 227                 return -EINVAL;
 228
 229         get_group_info(current->cred->group_info);
 230         i = current->cred->group_info->ngroups;
 231         if (gidsetsize) {
 232                 if (i > gidsetsize) {
 233                         i = -EINVAL;
 234                         goto out;
 235                 }
 236                 if (groups16_to_user(grouplist, current->cred->group_info)) {
 237                         i = -EFAULT;
 238                         goto out;
 239                 }
 240         }
 241 out:
 242         put_group_info(current->cred->group_info);
 243         return i;
 244 }
 245
 246 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 247 {
 248         struct group_info *group_info;
 249         int retval;
 250
 251         if (!capable(CAP_SETGID))
 252                 return -EPERM;
 253         if ((unsigned)gidsetsize > NGROUPS_MAX)
 254                 return -EINVAL;
 255
 256         group_info = groups_alloc(gidsetsize);
 257         if (!group_info)
 258                 return -ENOMEM;
 259         retval = groups16_from_user(group_info, grouplist);
 260         if (retval) {
 261                 put_group_info(group_info);
 262                 return retval;
 263         }
 264
 265         retval = set_current_groups(group_info);
 266         put_group_info(group_info);
 267
 268         return retval;
 269 }
 270
 271 asmlinkage long sys32_getuid16(void)
 272 {
 273         return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
 274 }
 275
 276 asmlinkage long sys32_geteuid16(void)
 277 {
 278         return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
 279 }
 280
 281 asmlinkage long sys32_getgid16(void)
 282 {
 283         return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
 284 }
 285
 286 asmlinkage long sys32_getegid16(void)
 287 {
 288         return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
 289 }
 290
 291 /*
 292  * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 293  *
 294  * This is really horribly ugly.
 295  */
 296 #ifdef CONFIG_SYSVIPC
 297 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
 298 {
 299         if (call >> 16)         /* hack for backward compatibility */
 300                 return -EINVAL;
 301         switch (call) {
 302         case SEMTIMEDOP:
 303                 return compat_sys_semtimedop(first, compat_ptr(ptr),
 304                                              second, compat_ptr(third));
 305         case SEMOP:
 306                 /* struct sembuf is the same on 32 and 64bit :)) */
 307                 return sys_semtimedop(first, compat_ptr(ptr),
 308                                       second, NULL);
 309         case SEMGET:
 310                 return sys_semget(first, second, third);
 311         case SEMCTL:
 312                 return compat_sys_semctl(first, second, third,
 313                                          compat_ptr(ptr));
 314         case MSGSND:
 315                 return compat_sys_msgsnd(first, second, third,
 316                                          compat_ptr(ptr));
 317         case MSGRCV:
 318                 return compat_sys_msgrcv(first, second, 0, third,
 319                                          0, compat_ptr(ptr));
 320         case MSGGET:
 321                 return sys_msgget((key_t) first, second);
 322         case MSGCTL:
 323                 return compat_sys_msgctl(first, second, compat_ptr(ptr));
 324         case SHMAT:
 325                 return compat_sys_shmat(first, second, third,
 326                                         0, compat_ptr(ptr));
 327         case SHMDT:
 328                 return sys_shmdt(compat_ptr(ptr));
 329         case SHMGET:
 330                 return sys_shmget(first, (unsigned)second, third);
 331         case SHMCTL:
 332                 return compat_sys_shmctl(first, second, compat_ptr(ptr));
 333         }
 334
 335         return -ENOSYS;
 336 }
 337 #endif
 338
 339 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 340 {
 341         if ((int)high < 0)
 342                 return -EINVAL;
 343         else
 344                 return sys_truncate(path, (high << 32) | low);
 345 }
 346
 347 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 348 {
 349         if ((int)high < 0)
 350                 return -EINVAL;
 351         else
 352                 return sys_ftruncate(fd, (high << 32) | low);
 353 }
 354
 355 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 356                                 struct compat_timespec __user *interval)
 357 {
 358         struct timespec t;
 359         int ret;
 360         mm_segment_t old_fs = get_fs ();
 361
 362         set_fs (KERNEL_DS);
 363         ret = sys_sched_rr_get_interval(pid,
 364                                         (struct timespec __force __user *) &t);
 365         set_fs (old_fs);
 366         if (put_compat_timespec(&t, interval))
 367                 return -EFAULT;
 368         return ret;
 369 }
 370
 371 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 372                         compat_sigset_t __user *oset, size_t sigsetsize)
 373 {
 374         sigset_t s;
 375         compat_sigset_t s32;
 376         int ret;
 377         mm_segment_t old_fs = get_fs();
 378
 379         if (set) {
 380                 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 381                         return -EFAULT;
 382                 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 383         }
 384         set_fs (KERNEL_DS);
 385         ret = sys_rt_sigprocmask(how,
 386                                  set ? (sigset_t __force __user *) &s : NULL,
 387                                  oset ? (sigset_t __force __user *) &s : NULL,
 388                                  sigsetsize);
 389         set_fs (old_fs);
 390         if (ret) return ret;
 391         if (oset) {
 392                 s32.sig[1] = (s.sig[0] >> 32);
 393                 s32.sig[0] = s.sig[0];
 394                 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 395                         return -EFAULT;
 396         }
 397         return 0;
 398 }
 399
 400 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 401                                 size_t sigsetsize)
 402 {
 403         sigset_t s;
 404         compat_sigset_t s32;
 405         int ret;
 406         mm_segment_t old_fs = get_fs();
 407
 408         set_fs (KERNEL_DS);
 409         ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 410         set_fs (old_fs);
 411         if (!ret) {
 412                 s32.sig[1] = (s.sig[0] >> 32);
 413                 s32.sig[0] = s.sig[0];
 414                 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 415                         return -EFAULT;
 416         }
 417         return ret;
 418 }
 419
 420 asmlinkage long
 421 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 422 {
 423         siginfo_t info;
 424         int ret;
 425         mm_segment_t old_fs = get_fs();
 426
 427         if (copy_siginfo_from_user32(&info, uinfo))
 428                 return -EFAULT;
 429         set_fs (KERNEL_DS);
 430         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
 431         set_fs (old_fs);
 432         return ret;
 433 }
 434
 435 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 436                                 size_t count, u32 poshi, u32 poslo)
 437 {
 438         if ((compat_ssize_t) count < 0)
 439                 return -EINVAL;
 440         return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 441 }
 442
 443 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 444                                 size_t count, u32 poshi, u32 poslo)
 445 {
 446         if ((compat_ssize_t) count < 0)
 447                 return -EINVAL;
 448         return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 449 }
 450
 451 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 452 {
 453         return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 454 }
 455
 456 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
 457 {
 458         mm_segment_t old_fs = get_fs();
 459         int ret;
 460         off_t of;
 461
 462         if (offset && get_user(of, offset))
 463                 return -EFAULT;
 464
 465         set_fs(KERNEL_DS);
 466         ret = sys_sendfile(out_fd, in_fd,
 467                            offset ? (off_t __force __user *) &of : NULL, count);
 468         set_fs(old_fs);
 469
 470         if (offset && put_user(of, offset))
 471                 return -EFAULT;
 472
 473         return ret;
 474 }
 475
 476 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
 477                                 compat_loff_t __user *offset, s32 count)
 478 {
 479         mm_segment_t old_fs = get_fs();
 480         int ret;
 481         loff_t lof;
 482
 483         if (offset && get_user(lof, offset))
 484                 return -EFAULT;
 485
 486         set_fs(KERNEL_DS);
 487         ret = sys_sendfile64(out_fd, in_fd,
 488                              offset ? (loff_t __force __user *) &lof : NULL,
 489                              count);
 490         set_fs(old_fs);
 491
 492         if (offset && put_user(lof, offset))
 493                 return -EFAULT;
 494
 495         return ret;
 496 }
 497
 498 struct stat64_emu31 {
 499         unsigned long long  st_dev;
 500         unsigned int    __pad1;
 501 #define STAT64_HAS_BROKEN_ST_INO        1
 502         u32             __st_ino;
 503         unsigned int    st_mode;
 504         unsigned int    st_nlink;
 505         u32             st_uid;
 506         u32             st_gid;
 507         unsigned long long  st_rdev;
 508         unsigned int    __pad3;
 509         long            st_size;
 510         u32             st_blksize;
 511         unsigned char   __pad4[4];
 512         u32             __pad5;     /* future possible st_blocks high bits */
 513         u32             st_blocks;  /* Number 512-byte blocks allocated. */
 514         u32             st_atime;
 515         u32             __pad6;
 516         u32             st_mtime;
 517         u32             __pad7;
 518         u32             st_ctime;
 519         u32             __pad8;     /* will be high 32 bits of ctime someday */
 520         unsigned long   st_ino;
 521 };
 522
 523 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 524 {
 525         struct stat64_emu31 tmp;
 526
 527         memset(&tmp, 0, sizeof(tmp));
 528
 529         tmp.st_dev = huge_encode_dev(stat->dev);
 530         tmp.st_ino = stat->ino;
 531         tmp.__st_ino = (u32)stat->ino;
 532         tmp.st_mode = stat->mode;
 533         tmp.st_nlink = (unsigned int)stat->nlink;
 534         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 535         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 536         tmp.st_rdev = huge_encode_dev(stat->rdev);
 537         tmp.st_size = stat->size;
 538         tmp.st_blksize = (u32)stat->blksize;
 539         tmp.st_blocks = (u32)stat->blocks;
 540         tmp.st_atime = (u32)stat->atime.tv_sec;
 541         tmp.st_mtime = (u32)stat->mtime.tv_sec;
 542         tmp.st_ctime = (u32)stat->ctime.tv_sec;
 543
 544         return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 545 }
 546
 547 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 548 {
 549         struct kstat stat;
 550         int ret = vfs_stat(filename, &stat);
 551         if (!ret)
 552                 ret = cp_stat64(statbuf, &stat);
 553         return ret;
 554 }
 555
 556 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 557 {
 558         struct kstat stat;
 559         int ret = vfs_lstat(filename, &stat);
 560         if (!ret)
 561                 ret = cp_stat64(statbuf, &stat);
 562         return ret;
 563 }
 564
 565 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 566 {
 567         struct kstat stat;
 568         int ret = vfs_fstat(fd, &stat);
 569         if (!ret)
 570                 ret = cp_stat64(statbuf, &stat);
 571         return ret;
 572 }
 573
 574 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 575                                 struct stat64_emu31 __user* statbuf, int flag)
 576 {
 577         struct kstat stat;
 578         int error;
 579
 580         error = vfs_fstatat(dfd, filename, &stat, flag);
 581         if (error)
 582                 return error;
 583         return cp_stat64(statbuf, &stat);
 584 }
 585
 586 /*
 587  * Linux/i386 didn't use to be able to handle more than
 588  * 4 system call parameters, so these system calls used a memory
 589  * block for parameter passing..
 590  */
 591
 592 struct mmap_arg_struct_emu31 {
 593         compat_ulong_t addr;
 594         compat_ulong_t len;
 595         compat_ulong_t prot;
 596         compat_ulong_t flags;
 597         compat_ulong_t fd;
 598         compat_ulong_t offset;
 599 };
 600
 601 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 602 {
 603         struct mmap_arg_struct_emu31 a;
 604
 605         if (copy_from_user(&a, arg, sizeof(a)))
 606                 return -EFAULT;
 607         if (a.offset & ~PAGE_MASK)
 608                 return -EINVAL;
 609         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 610                               a.offset >> PAGE_SHIFT);
 611 }
 612
 613 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 614 {
 615         struct mmap_arg_struct_emu31 a;
 616
 617         if (copy_from_user(&a, arg, sizeof(a)))
 618                 return -EFAULT;
 619         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 620 }
 621
 622 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 623 {
 624         if ((compat_ssize_t) count < 0)
 625                 return -EINVAL;
 626
 627         return sys_read(fd, buf, count);
 628 }
 629
 630 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
 631 {
 632         if ((compat_ssize_t) count < 0)
 633                 return -EINVAL;
 634
 635         return sys_write(fd, buf, count);
 636 }
 637
 638 /*
 639  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 640  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 641  * because the 31 bit values differ from the 64 bit values.
 642  */
 643
 644 asmlinkage long
 645 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 646 {
 647         if (advise == 4)
 648                 advise = POSIX_FADV_DONTNEED;
 649         else if (advise == 5)
 650                 advise = POSIX_FADV_NOREUSE;
 651         return sys_fadvise64(fd, offset, len, advise);
 652 }
 653
 654 struct fadvise64_64_args {
 655         int fd;
 656         long long offset;
 657         long long len;
 658         int advice;
 659 };
 660
 661 asmlinkage long
 662 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 663 {
 664         struct fadvise64_64_args a;
 665
 666         if ( copy_from_user(&a, args, sizeof(a)) )
 667                 return -EFAULT;
 668         if (a.advice == 4)
 669                 a.advice = POSIX_FADV_DONTNEED;
 670         else if (a.advice == 5)
 671                 a.advice = POSIX_FADV_NOREUSE;
 672         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 673 }